https://blog.wongcw.com/2018/10/21/ge%e5%8f%91%e5%b8%83%e5%85%a8%e6%96%b0%e8%b6%85%e9%9f%b3%e9%80%9f%e6%b0%91%e7%94%a8%e9%a3%9e%e6%9c%ba%e5%8f%91%e5%8a%a8%e6%9c%baaffinity/